Method of making high-finish sheets



8. R. SHOVER METHOD OF MAKING HIGH FINISH SHEETS Jan. '17, 1928.

- Filed April 26, 1922 Imezzior: 5457'0/V E 59 01 515 Patented Jan. 17,1928.

UNITED STATES BAR'IDN R. SHOVER, OF PITTSBURGH, PENNSYLVANIA.

METHOD OF MAKING HIGH-FINISH SHEETS.

Application filed April 26, 1922. Serial no. 556,710. a

This invention relates to ferrous metal sheets and plates having a highfinish on one or both surfaces thereof and method of making the same,and has for its principal object the provision of a method that willcheapen the manufacture of such sheets and plates, and produce sheetsand plates having a better finish than those produced by any existingmethods, of which I am aware, in a rapid and efficient manner.

Heretofore, in the manufacture of high finished ferrous metal sheets orplates for use in making hoods, fenders, and bodies of automobiles,steel furniture and other products requiring a smooth, even finish ofpaint or enamel, the sheets, after being hot rolled in' the usual mannerhave been pickled or otherwise operated upon toremove the scale andclean them. The cleaned'sheets are then annealed and finally are coldrolled to obtain the desired finish. The excessive number of passesthrough the cold rolls necessary to produce the required finish by coldrolling hardens the sheets to such an extent that they can not besuccessfully shaped or formed. So the practice heretofore has been to dothe major portion of the cold rolling necessary to produce the desiredfinish, to then again anneal the sheets andthen again cold roll them,until the desired finish is obtained, thus necessitating at least twoannealing operations and two cold rolling operations to produce thefinished sheets. At best, the sheets produced under these condi-, tionsare harder and stiffer than desired for a considerable amount ofbendingor shaping and much harder than if they could be usedafterannealing and without further 01a rolling. However, annealing plates astofore made destroys the igh finish and the must be again cold rolled toproduce suc finish. 3

Many of the finished plates made under existing methods are found tohave small surface defects which are not removed by cold rolling, andthese plates must then be discarded as seconds or Wasters according tothe character of the defects. My method consists in the formation on thesurface of the sheets, after they are hot rolled, pickled, or otherwisecleaned and, in some cases, annealed, of an alloy which will be softerthan the steel of the plates, and then cold rolling the sheets. The coldrolling i o eration, in addition 'to reducing the auge of the sheet,will spread the alloy and any depressions or inequalities in thesurfaces of the sheet or plate and results in'a smooth surface, withmaterially less cold rolling than is necessary to finish the ferrousmetal sheets as heretofore manufactured. Less pressure extends throughthe alloy into the ferrous metal sheets, and consequently the sheets arenot hardened as much as if the had no alloy applied, and this togetherwith the reduced number of passes necessary to produce the high finishresults in high finstand of cold rolls with a sheet or p atetherebetween as in the cold rolling operations. I

In forming the alloy on the;- ferrous metal sheets or plates 2, afterthey have been hot rolled and in some cases after they have beenannealed, a non-ferrous metal is used, such as zincor'aluminum incoating the sheets or plates, much in the same manner as galvaniz ing,sherardizing or calorizing is nowcarried on, so as to rovide anon-oxidizing surfaceon the ferrous metal. This alloy surface on .thesheets isformed of a mixture of the ferrous metal of the sheet and thenon-ferrous coating metal and, consists of an alloy layer 3 integrallyunited with the ferrous body of the sheet and an extremely thin outerlayer 4 of substantially pure coating metal.

, It, of course, will be understood that in some cases the alloy surfacemay be applied to only: one side of the ferrous base and also u p thatthe'jalloy coating may be applied or formed on the ferrous base in otherways, such as by hot galvanizing or tinning. After the sheets or plates2 have the alloy number of asses between the cold rolls 5 and 6, whicserves to spread the alloy and I faces of the sheet and impanta polishedhigh finish to the surfaces. The alloy bein softer fill any depressionsor inequalities in the sur- I than the metal of the sheet 2, mat'eria yless cold rolling is necessary than would be necessary to finish thematerials if they had no alloy surface.

Obviously my improved method can be no i used in making the materialsknown to the 100. surface formed thereon they are given a trade asstrips and cold rolled stri s and theterms sheets and plates as .usederein are intended to include such strips and cold rolled strips.

I claim z--- a 1. The method of making high finish metal sheets andplates which consists in p I rolling heated blanks into sheets orplates,

reparing the surfaces thereof, for coating y pickling the rolled sheetsand plates, conditioning the pickled sheets or plates for finishing bycoating at least one surface thereof with a softer metal and [impartingthe high finish to the coated surfaces of the sheets or plates bycoldrolling.

2. The method of making high finish metal sheets and plates whichconsists in rolling heated blanks into sheets or plates, preparingthesurfaces thereof for coating by pickling the rolled sheets and plates,conditioning the pickled sheets or plates for finishing by coating atleast one surface thereof withan alloy layer of a softer metal andimparting the high finish to the coated surfaces of the sheets or platesby cold rolling.

3. The method of making high finish metal sheets and lates whichconsists in rolling heated blanks into sheets or plates, preparing thesurfaces thereof for coating by pickthereof with a softer non-ferrousmetal, and imparting the high finish to the coated surfaces of thesheets or plates by cold rolling.

5. The method of making high finish metal sheets and plates whichconsists in rolling heated blanks into sheets or plates, softening therolled sheets or plates by annealing, preparing the surfaces thereof forcoating by pickling the annealed sheets and plates, conditioning thepickled sheets or plates for finishing by coating at least one surfacethereof with a softer metal, and imparting the high finish to the coatedsurfaces of the sheets or plates by cold rolling.

6. The method of making high finish metal sheets and plates whichconsists in rolling heated blanks into'sheets or plates, preparing thesurfaces thereof by pickling the r0 ed sheets and plates, conditioningthe ickled sheets or plates for finishin by coatmg at least one surfacethereof wit a softer metal, imparting the high finish to the surfaces ofthe coated sheets or (plates by cold rollin and annealing the colrolled. sheets and plates.

7. The method of making high finish metal sheets and plates whichconsists in' rolling heated blanks into multiple len h sheets or plates,preparing the surfaces t ereof for coating by pickling the rolled sheetsand plates, conditioning the pickled sheets or plates for finishing bycoating at least one surface thereof with a softer metal and impartingthe high finish to the coated surfaces of the sheets or plates by coldrolling.

8. A new article of manufacture consisting of a ferrous metal sheet orplate having the high finish characteristic of cold rolling on at leastone surface thereof, said high finish surface being formed of an alloyof the ferrous metal and a softer non-ferrous metal.

9'. A new article of manufacture consisting of an annealed ferrous metalsheet or plate having the high finish characteristic of cold rolling onat least one surface thereof, said high finish surface bein formed of analloy of the ferrous metal an a softer non-ferrous metal.

10. A new article of manufacture consisting of a ferrous metalsheet orplate having the high finish characteristic of cold rolling on thesurfaces thereof, said high finish surfaces being formed of an alloy ofthe ferrous metal and a softer non-ferrous metal.

11. A new article of manufacture consisting of a soft annealed ferrousmetal sheet or plate having the'high finish characteristic of coldrolling on the surfaces thereof, said high finish surfaces being formedof an alloy of the ferrous metal with a softer non-ferrous metal. p

In testimony whereof I have hereunto signed my name.

BARTON R. SHOVER.

